Dear Group:
What is appropriate techniques for measuring between gender differences in
BOLD-fMRI brain activity assuming there are difference in brain structural
size and morphology between the sexes. Would a spatial extent cluster
taliarach based analysis stil be valid if sizes are different or would
there be betters ways?
Thanks
Sincerely,
Jeff Lorberbaum
Medical University of South Carolina
On Mon, 22 Sep 2003, John Ashburner
wrote:
> >
> > As far as I understand, you only need to replace the original probability
> > maps in the apriori directory with what you newly created.
> >
> > In fact, it may be wise to rename the original apriori directory to another
> > name. You then create a new directory, name it as "apriori" and move all
> > your maps into this directory. SPM2 will use them instead of the original
> > maps.
>
> This would work - but a better way would be to change the defaults (either in
> spm_defaults.m, or by starting spm and typing:
>
> global defaults
> defaults.segment.estimate.priors = spm_get(3,'*.IMAGE','Select your priors');
>
> This would work for the remainder of your SPM session (or until you reset the
> defaults, or re-run spm_defaults.m).
>
> Best regards,
> -John
>
> > I've created customised templates and prior maps using John Ashburner's
> > script (see attached). What do I have to change in SPM2 to make sure that
> > the segmentation process uses the new customised prior (for
> > gray/white/csf).
>
>
> --
> Dr John Ashburner.
> Functional Imaging Lab., 12 Queen Square, London WC1N 3BG, UK.
> tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381
> fax: +44 (0)20 78131420 http://www.fil.ion.ucl.ac.uk/~john
>
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